Find the Bottleneck
What's the one thing that, if it broke, would stop everything?
Write down the goal you're pursuing and the steps required to reach it. Now identify the single step that, if it slowed down, would slow everything else down — regardless of how fast the other steps are. That's your bottleneck. Improving anything else while the bottleneck remains is waste. Focus everything on the constraint.
Progress feels slow despite effort, or you're investing resources across multiple areas without clear improvement.
The system is genuinely balanced and there's no single dominant constraint.
Why it works
In any system, throughput is determined by the weakest link. Improving non-bottleneck steps creates the illusion of progress while the real constraint stays untouched.
A factory that can produce 100 units per hour at every stage except one that produces 50 has a total output of 50. Speeding up any other stage to 200 does nothing — the bottleneck sets the pace. This applies everywhere: in your career, the bottleneck might be a missing skill. In your business, it might be a single approval process. In your project, it might be one person’s availability. The natural instinct is to improve what’s easiest to improve, which is rarely the bottleneck. The discipline is to identify the constraint, focus all improvement effort there, and accept that everything else is secondary until the bottleneck moves.